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WO2000050296A1 - Engrenage de marche av pour bicyclette - Google Patents

Engrenage de marche av pour bicyclette Download PDF

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Publication number
WO2000050296A1
WO2000050296A1 PCT/KR2000/000146 KR0000146W WO0050296A1 WO 2000050296 A1 WO2000050296 A1 WO 2000050296A1 KR 0000146 W KR0000146 W KR 0000146W WO 0050296 A1 WO0050296 A1 WO 0050296A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
driving wheel
reverse
ratchet
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2000/000146
Other languages
English (en)
Korean (ko)
Inventor
Chun Kil Park
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AU26980/00A priority Critical patent/AU2698000A/en
Publication of WO2000050296A1 publication Critical patent/WO2000050296A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
    • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
    • B62M11/14—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • E02D5/808—Ground anchors anchored by using exclusively a bonding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
    • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
    • B62M11/06—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with spur gear wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
    • B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/003—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion the gear ratio being changed by inversion of torque direction
    • F16H3/005—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion the gear ratio being changed by inversion of torque direction for gearings using gears having orbital motion
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0004—Synthetics
    • E02D2300/0006—Plastics

Definitions

  • the present invention relates to a forward driving gear for bicycle, and more particularly, to a forward driving gear for bicycle, which can transfer power in such a manner that a bicycle drives forward whether the pedaling is forward or in reverse keeping always the same velocity ratio.
  • a driving gear of bicycle includes a drive sprocket arranged on a pedal shaft, a driven sprocket arranged on a hub spindle of a rear wheel, a chain connecting the sprockets, and a clutch device which is rotated only when a rotation is applied to the drive sprocket in a certain direction, i.e., in the forward direction of a bicycle (normal direction).
  • the conventional driving gear allows the bicycle to drive forward through only the forward rotation of the pedal. Therefore, the driving operation of the pedal is simple, and the pedaling in a single direction during driving for a long time results in fatigue of muscle of the driver's femoral region. With the intention of relaxing the fatigue of the muscle, when the driver does not pedal to take a rest or rotates the pedal in the reverse direction, the bicycle loses the inertia during the idle rotation of the pedal shaft, thereby causing a loss of power.
  • One of the developed and practically used forward driving gears includes a driving part for transferring a driving power of a pedal shaft, which is rotatably inserted into a boss of a frame, to a drive sprocket, a change over part which is detachably mounted on the driving part and changes the reverse and idle rotation of the pedal shaft into the forward rotation to transfer the forward rotation to the drive sprocket, and a change over lever part for detachably mounting the change over part on the driving part according to a driver ' s manipulation.
  • the forward driving gear with the above structure, when the driver manipulates a lever of the change over lever part during driving, the change over part is connected to the driving part. Therefore, when the pedal is rotated in the reverse direction, the direction of rotation is changed in the forward direction and the changed direction is transferred to the driving part.
  • the forward driving gear allows the bicycle to drive forward whether the pedaling is forward or in reverse.
  • the driver must manipulate the lever of the change over lever part to connect the change over part to the driving part when the bicycle drives forward by the reverse rotation of the pedal during traveling. Furthermore, if the driver wants to return the bicycle in the forward driving state by the forward rotation of the pedal or to drag and move the bicycle, the driver must manipulate again the lever to release the change over part from the driving part. The manipulation of lever provides the driver with annoyance and trouble in operation of the bicycle.
  • the forward driving gear has a structure that a R.RM. ratio is reduced in the process of transferring the rotation of the pedal through the change over part to the driving part.
  • the R.RM ratio reduction structure results in preventing the maintenance of the speed of traveling in the same speed as the forward rotation of the pedal, thereby causing a loss of power and a drop in efficiency.
  • the forward driving gear with complicate structure in which the change over part and the change over lever part have a number of components, results in a drop in productivity and a rise of manufacturing cost.
  • the present invention provides a forward driving gear for bicycle, including: a pedal shaft which is rotatably inserted into a boss of a bicycle frame and on opposite end portions of which a pair of pedal bars are fixed for rotating with the rotation of the pedal; internal and external discs arranged on the pedal shaft at a prescribed interval for preventing the occurrence of interference during the rotation of the pedal shaft; a housing formed in a cylindrical drum shape surrounding the circumferences of the internal and external discs, the housing being disposed on the pedal shaft and rotated in the same direction as the pedal bar; a drive sprocket arranged abutting on the outer circumference of the housing; a forward driving wheel of a ring shape, which is formed in integration with the drive sprocket to avoid the interference with the rotation of the housing, and which is supported on the internal disc for a rolling
  • Figure 1 is a partially cutaway view in perspective of a forward driving gear according to a first preferred embodiment of this invention
  • Figure 2 is a sectional view of the forward driving gear of the first preferred embodiment
  • Figure 3 is a perspective view of a structure of a two-way ratchet applied to the forward driving gear
  • Figure 4a is a view showing a state that the two-way ratchet is engaged to a forward ratchet gear by elasticity of a compression spring when a pedal rotates in a forward direction (right-hand screw locking direction);
  • Figure 4b is a view showing a state that the two-way ratchet is engaged to a reverse ratchet gear over the elasticity of the compression spring when the pedal rotates in the reverse direction (right-hand screw loosening direction);
  • Figure 5 a is a schematic view of a forward driving mechanism, showing a power transfer state in the condition of Figure 4a when the pedal rotates in the forward direction
  • Figure 5b is a schematic view of the forward driving mechanism, showing a power transfer state in the condition of Figure 4b when the pedal rotates in the reverse direction;
  • Figure 6 is a perspective view of a structure of a two-way ratchet according to a second preferred embodiment of this invention
  • Figure 7a is a view showing a state that the two-way ratchet of Figure 6 is engaged to a forward ratchet gear by a forward pressure when a pedal rotates in a forward direction;
  • Figure 7b is a view showing a state that the two-way ratchet of Figure 6 is engaged to a reverse ratchet gear by a reverse pressure when the pedal rotates in the reverse direction;
  • Figure 8 is a partially cutaway view in perspective of a forward driving gear according to a third preferred embodiment of this invention.
  • Figure 9 is a sectional view of the forward driving gear according to the 5 third preferred embodiment.
  • Figure 10 is a perspective view of a structure of a two-way ratchet applied to the forward driving gear of the third preferred embodiment
  • Figure 1 la is a view showing a state that the two-way ratchet of Figure 10 is engaged to a forward ratchet gear by elasticity of a compression spring c when the pedal rotates in a forward direction;
  • Figure l ib is a view showing a state that the two-way ratchet of Figure 10 is engaged to a reverse ratchet gear by elasticity of the compression spring when the pedal rotates in the reverse direction;
  • Figure 12a is a schematic view of a forward driving mechanism, 5 showing a power transfer state in the condition of Figure 11a when the pedal rotates in the forward direction;
  • Figure 12b is a schematic view of the forward driving mechanism, showing a power transfer state in the condition of Figure 4b when the pedal rotates in the reverse direction;
  • Figure 13 is a partially cutaway view in perspective of a forward driving gear according to a fourth preferred embodiment of this invention.
  • Figure 14 is a sectional view of the forward driving gear according to the fourth preferred embodiment.
  • Figure 15a is a view showing a state that a two-way ratchet applied to the forward driving gear of Figure 14 is engaged to a forward ratchet gear arranged outside the pedal shaft when the pedal rotates in a forward direction;
  • Figure 15b is a view showing a state that the two-way ratchet is engaged to a reverse ratchet gear arranged outside the pedal shaft when the pedal rotates in the reverse direction;
  • Figure 16a is a schematic view of a forward driving mechanism, showing a power transfer state in the condition of Figure 15a when the pedal rotates in the forward direction;
  • Figure 16b is a schematic view of the forward driving mechanism, showing a power transfer state in the condition of Figure 15b when the pedal rotates in the reverse direction.
  • a forward driving gear for bicycle according to the present invention can be installed on a pedal shaft or a rear wheel hub shaft by a structural transformation according to an installation environment. Preferred embodiments of the forward driving gear for bicycle will be respectively described hereinafter in detail.
  • Figures 1 through 7b illustrate first and second embodiments of the forward driving gear mounted on a pedal shaft 5.
  • Figure 1 illustrates a partially cutaway view in perspective of the forward driving gear according to the first preferred embodiment
  • Figure 2 illustrates a sectional view of the forward driving gear.
  • Figure 3 illustrates a perspective view of a structure of a two-way ratchet 70 of the first embodiment.
  • Figure 4a shows a state that the two-way ratchet is engaged to a forward ratchet gear 51 by elasticity of a compression spring 75 when a pedal rotates in a forward direction
  • Figure 4b shows a state that the two-way ratchet 70 is engaged to a reverse ratchet gear 61 over the elasticity of the compression spring 75 when the pedal rotates in the reverse direction.
  • Figure 5a illustrates a schematic view showing a power transfer state in the condition of Figure 4a when the pedal rotates in the forward direction
  • Figure 5b illustrates a schematic view showing a power transfer state in the condition of Figure 4b when the pedal rotates in the reverse direction
  • Figure 6 shows a structure of a two-way ratchet 270 according to a second preferred embodiment.
  • Figure 7a shows a state that the two-way ratchet 270 of Figure 6 is engaged to a forward ratchet gear 51 by a forward pressure from a latch hole 33a when a pedal rotates in a forward direction
  • Figure 7b shows a state that the two-way ratchet 270 of Figure 6 is engaged to a reverse ratchet gear 61 by a reverse pressure from the latch hole 33a when the pedal rotates in the reverse direction.
  • the forward driving gear for bicycle includes: a pedal shaft 5 which is rotatably inserted into a boss 2 of a bicycle frame 1 and on opposite end portions of which a pair of pedal bars 4 are fixed by stop nuts 6 for rotating with the rotation of the pedal; internal and external discs 10 and 20 which are arranged on the pedal shaft 5 at a prescribed interval and have a bearing bush 3 and a ball bearing 14 interposed therebetween for preventing the occurrence of interference during the rotation of the pedal shaft 5; a housing 30 formed in a cylindrical drum shape surrounding the circumferences of the internal and external discs 10 and 20, the housing 30 being disposed on the pedal shaft 5 and rotated in the same direction as the pedal bar 4; a drive sprocket 40 of a multistage which is arranged abutting on the outer circumference of the housing 30; a forward driving wheel 50 of a ring shape, which is formed in integration with the drive spro
  • the housing 30 has a latch protrusion 32 protruded from the external side of a housing body 31 of a circular disc for latching the rotating pedal bar 4, and a ratchet groove 33 formed on the inner circumference of the housing 30 for receiving the two-way ratchet 70.
  • the drive sprocket 40 is made by stacking a plurality of drive sprockets 40, the diameters of which are differ from each other, for multiple gearshift to regulate a R.RM ratio during a driving of the bicycle.
  • the forward driving wheel 50 has a forward ratchet gear 51 formed on the outer circumference thereof and an inner gear 52 formed on the inner circumference
  • the reverse driving wheel 60 has a reverse ratchet gear 61 is formed on the outer circumference thereof and an inner gear 62 formed on the inner circumference.
  • the inner gears 52 and 62 are engaged with the directional selecting intermediate gear 80 in a tooth coupling.
  • the two-way ratchet 70 is engaged between the tooth of the forward ratchet gear 51 or the reverse ratchet gear 61.
  • the two-way ratchet 70 includes a ratchet body 71 of a prescribed length, wedge type end portions 72 which are formed at upper and lower sides of the ratchet body 71 in the opposite direction to each other, one of the end portions 72 being elastically supported from the ratchet groove 33 of the housing 30 by a compression spring 75, and rotary axis surfaces 73 which are longitudinally formed on the side ends of the ratchet body 71 and move along the inner circumference of the housing 30 in contact with the inner surface of the housing 30.
  • the directional selecting intermediate gear 80 includes an inscribed gear 81 which is rotatably fixed between fixing holes 12 and 22 of the internal and external discs 10 and 20 and engaged with the inner gear 62 of the reverse driving wheel 60, and an interlocking gear 83 which is rotatably fixed between the fixing holes 12 and 22 of the internal and external discs 10 and 20 and engaged with the inner gear 52 of the forward driving wheel 50 and the inscribed gear 81.
  • the directional selecting intermediate gear 80 may consist of a plurality of gears, which are located at symmetric positions around the pedal shaft 5.
  • a plurality of support rods can be disposed at locations, that the forward and reverse driving wheels 50 and 60 are not interrupted in their rotation, between the internal disc 10 and the external disc 20 and connected firmly with each other, although it is not illustrated in the drawings.
  • a plurality of bearing balls 13 are arranged on the contact portions between the internal disc 10 and the forward driving wheel 50, between the forward driving wheel 50 and the reverse driving wheel 60, and between the reverse driving wheel 60 and the external disc 20 at certain intervals for working in the rolling contact without interference from each other during their rotation.
  • the bearing balls 13 are to minimize a loss of power and a friction.
  • the reference character 11 indicates a pedal shaft insertion hole
  • 15 and 53 indicate ball contact surfaces and ball contact holes for seating the bearing balls 13
  • 74 indicates a spring seat for seating the compression spring 75
  • FIG. 6 through 7b another two-way ratchet 270 without needing the compression spring 75 may be applied to the housing 30.
  • the two-way ratchet 270 has an curvature portion 274 formed on a side portion of a ratchet body 271.
  • the curvature portion 274 is inserted into the hole 33a of the housing body 31.
  • the housing body 31 rotates in the forward or reverse directions, one of edges of the curvature portion 274 is pressurized and one of end portions 272 is in engagement with the forward ratchet gear 51 or the reverse ratchet gear 61 according to the direction of rotation of the housing body 31.
  • the forward driving gear having the above structure functions as follows.
  • both end portions 72 of the two-way ratchet 70 are rotated on a central axis of the ratchet body 71 by the rotary axis surface 73, which moves along the curved surface of the ratchet groove 33 in contact with the inner surface of the ratchet groove 33.
  • the reverse ratchet gear 61 engaged with the end portion 72 of the two-way ratchet 70 rotates the reverse driving wheel 60.
  • the inscribed gear 81 which is in engagement with the reverse driving wheel 60 is also rotated in the reverse direction and the interlocking gear 83 which is in engagement with the inscribed gear 81 is rotated in the forward direction.
  • the forward driving wheel 50 and the drive sprocket 40 are also rotated in the forward direction, so that the bicycle can drive in the forward direction.
  • the forward driving gear for bicycle according to the present invention can always drive the bicycle in the forward direction without manipulation of a lever whether the pedaling is forward or in reverse.
  • the two-way ratchet 270 according to the second preferred embodiment has the same principle of operation as the first embodiment, besides the structure that one of the end portions 272 has the curvature portion, which is inserted into the ratchet groove 33 of the housing body 31. Therefore, the operation of the two-way ratchet 272 is omitted.
  • Figures 8 through 12b show a third preferred embodiment of the forward driving gear, which is mounted on a rear hub shaft 9.
  • Figure 8 is a partially cutaway view in perspective
  • Figure 9 is a sectional view of the forward driving gear according to the third preferred embodiment of the present invention.
  • Figure 10 is a perspective view of a structure of a two-way ratchet 170 applied to the third embodiment.
  • Figure 1 la shows a state that the two-way ratchet 170 is engaged to the forward ratchet gear 151 by elasticity of a compression spring 175 when the pedal rotates in the forward direction
  • Figure 1 lb shows a state that the two-way ratchet 170 is engaged to a reverse ratchet gear 161 by elasticity of the compression spring 175 when the pedal rotates in the reverse direction
  • Figure 12a schematically shows a power transfer state in the condition of Figure 11a when the pedal rotates in the forward direction
  • Figures 12b schematically shows a power transfer state in the condition of Figure lib when the pedal rotates in the reverse direction.
  • the forward driving gear for bicycle includes: a hub shaft 5 which is rotatably mounted on a fixing shaft 8, on which a rear wheel frame 7 is fixed, for fastening a rim reinforcement of a rear wheel; internal and external discs 110 and 120 which are fixed on the fixing shaft 8 at a prescribed interval; a forward driving wheel 150 of a ring shape, which is connected to the hub shaft 9 by a screw and supported for the rolling contact by the internal disc 110; a reverse driving wheel 160 of a ring shape, which is supported on a side of the forward driving wheel 150 and the external disc 120; a driven sprocket 140 surrounding the outer circumferences of the forward driving wheel 150 and the reverse driving wheel 160, which is connected to a drive sprocket 40 of the pedal shaft 5 by a chain for a slave rotation in the same direction as the drive sprocket 40 by the rotation transferred from the drive sprocket 40; a two-way ratchet 170 mounted on the inner circumference of the
  • a frame holder 124 is mounted near a fixing shaft insertion hole 111 formed in the center of the external disc 120 for fastening the rear wheel frame 7, so that the fixing shaft 8, the external disc 120 and the rear wheel frame 7 can be connected.
  • the external disc 120 includes a pair of protrusions 123 formed at upper and lower portions around the fixing shaft insertion hole 111 for fastening the frame holder 124.
  • the frame holder 124 includes the fixing shaft insertion hole 111 of the same size as the external disc 120, a pair of frame support bars 125 which are formed at one side thereof at a prescribed interval and parallel to each other, and a pair of latch protrusions 126 formed on the ends of the frame support bars 125 for latching the rear wheel frame 7.
  • the drive sprocket 140 is made by stacking a plurality of drive sprockets 140, the diameters of which are differ from each other, for multiple gearshift to regulate a R.RM ratio during a driving of the bicycle.
  • the drive sprocket 140 has a ratchet groove 141 formed on the inner circumference thereof for receiving the two-way ratchet 170.
  • the forward driving wheel 150 has a forward ratchet gear 151 formed on the outer circumference thereof and an inner gear 152 formed on the inner circumference
  • the reverse driving wheel 160 has a reverse ratchet gear 161 formed on the outer circumference thereof and an inner gear 162 formed on the outer circumference.
  • the inner gears 152 and 162 are engaged with the directional selecting intermediate gear 180 in a tooth coupling.
  • the two-way ratchet 170 is engaged between the tooth of the forward ratchet gear 151 and the reverse ratchet gear 161.
  • the two-way ratchet 170 includes a ratchet body 171 of a prescribed length, wedge type end portions 172 which are formed at upper and lower sides of the ratchet body 171 in the opposite direction to each other, and rotary axis surfaces 73 which are longitudinally formed on the side ends of the ratchet body 71 and rotate along the inner circumference of the drive sprocket 140.
  • a compression spring 175 is disposed on the center of the ratchet body 171 and elastically supports the end portions 172 to be pressurized toward the hub shaft 9.
  • the directional selecting intermediate gear 180 includes an inscribed gear 181 which is rotatably fixed between gear shaft fixing holes 112 and 122 of the internal and external discs 110 and 120 and is in engagement with the inner gear 162 of the reverse driving wheel 160, and an interlocking gear 183 which is rotatably fixed between the gear shaft fixing holes 112 and 122 of the internal and external discs 110 and 120 and is in engagement with the inner gear 152 of the forward driving wheel 150 and the inscribed gear 181.
  • the directional selecting intermediate gear 180 may consist of a plurality of gears which are located at symmetric positions around the pedal shaft 5.
  • a plurality of support rods can be disposed at locations, that the forward and reverse driving wheels 150 and 160 are not 5 interrupted in their rotation, between the internal disc 110 and the external disc 120, although it is not illustrated in the drawings.
  • a plurality of bearing balls 113 are arranged on the contact portions between the internal disc 110 and the forward driving wheel 150, between the forward driving wheel 150 and the reverse driving wheel 160, and between the C reverse driving wheel 160 and the external disc 120 at certain intervals for working in the rolling contact without interference from each other during their rotation.
  • the bearing balls 113 are to minimize a loss of power and the friction.
  • the reference characters 115 and 153 indicate ball contact surfaces and ball contact holes for seating the bearing balls 113, 154 5 inner space for receiving the internal disc 110, 155 a hub shaft connecting portion protruded from a side of the forward driving wheel 150, 156 a hub shaft fixing hole formed in the hub shaft connecting portion 155, 174 a spring seat for seating the compression spring 75, and 182 gear shafts passing through centers of the inscribed gear 181 and the interlocking gear 183.
  • C The two-way ratchet 270 described in the second embodiment can be applied also to the third embodiment.
  • the forward driving gear having the above structure functions as follows.
  • the power of the forward driving gear mounted on the hub shaft 9 according to the third embodiment is transferred through the pedal, drive sprocket 40, the chain, the driven sprocket 140, the two-way ratchet 170, the reverse driving wheel 160, the inscribed gear 181, the interlocking gear 183, the forward driving wheel 150 and through the hub shaft 9 to the rear wheel. Therefore, the forward driving gear for bicycle according to the present invention can always automatically change the direction of the rotation for the forward drive of the bicycle without manipulation of a lever when the driven sprocket 140 rotates in the forward or reverse directions.
  • the forward driving gear of the present invention can be simplified in its structure by mounting the two-way ratchet on the pedal shaft. Referring to Figures 13 through 16b, the structure will be described hereinafter in more detail.
  • Figure 13 is a partially cutaway view in perspective and Figure 14 is a sectional view of the forward driving gear according to a fourth preferred embodiment.
  • Figure 15a shows a state that a two-way ratchet 270 inserted into a pedal shaft 300 is in engagement with a forward ratchet gear 252 arranged outside the pedal shaft 300 when the pedal rotates in the forward direction
  • Figure 15b shows a state that the two-way ratchet 270 is in engagement with a reverse ratchet gear 262 arranged outside the pedal shaft 300 when the pedal rotates in the reverse direction.
  • the forward driving gear for bicycle includes: a pedal shaft 300 which is rotatably inserted into the boss 2, on opposite end portions of which a pair of pedal bars 4 are respectively fixed for rotating with the rotation of the pedal, and which has a larger diameter portion 310 and a ratchet groove 311 formed in the larger diameter portion 310; internal and external discs 210 and 220 which are arranged on the pedal shaft 300 at a prescribed interval for preventing the occurrence of interference during the rotation of the pedal shaft 300; a housing 230 of a cylindrical drum shape, which surrounds the outer circumference of the internal and external discs 210 and 220 and is disposed on the pedal shaft 300; a drive sprocket 240 which is formed in integration with the housing 230; a forward driving wheel
  • the two-way ratchet 270 includes a ratchet body 271 of a prescribed length, wedge type end portions 272 which are formed at upper and lower sides of the ratchet body 71 in the opposite direction to each other and are curved, a curvature portion 274 which is longitudinally formed on the center of the ratchet body 271, and a pair of rotary axles 273 formed on the upper and lower ends.
  • the rotary axles 273 of the two-way ratchet 270 are respectively supported by support rings 275, which have a plurality of pins 276 on the inner surface.
  • the two-way ratchet 270 has the same structure as the second embodiment, besides the structure that it is contacted with the inner circumferences of the forward and reverse driving wheels 250 and 260.
  • the directional selecting intermediate gear 280 includes a gear 281 which is rotatably fixed between the internal disc 210 and the external disc 220 and is in engagement with the external gear 251 of the forward driving wheel 250 and an interlocking gear 282 which is rotatably fixed between the internal disc 210 and the external disc 220 and is in engagement with the external gear 261 of the reverse driving wheel 260 and the gear 281.
  • the directional selecting intermediate gear 180 may consist of a plurality of gears which are located at symmetric positions around the pedal shaft 300.
  • a plurality of bearing balls 13 are arranged on the contact portions between the internal disc 210 and the reverse driving wheel 260 and between the reverse driving wheel 260 and the forward driving wheel 250 at certain intervals for working in the rolling contact without interference from each other during their rotation.
  • the pedal shaft 300 is modified in its shape. When the pedal rotates in the forward direction, the rotation is directly transferred from the pedal shaft 300 to the housing 230 through the medium of the two-way ratchet 270 inserted into the pedal shaft 300.
  • the forward driving gear for bicycle can allow the bicycle to drive in the forward direction whether pedaling is forward or in reverse without a manipulation of a lever, thereby resulting in a convenience in operation.
  • the simplified structure using the small numbers of components results in reducing the length of the assembly process and the manufacturing cost and being easy in repair and replacement of damaged components.
  • the forward driving gear for bicycle can transfer the driving power in the same speed ratio as the forward rotation when driving in the reverse direction, thereby resulting in reducing a loss of power and improving the efficiency.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
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  • Civil Engineering (AREA)
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  • Structure Of Transmissions (AREA)

Abstract

Cette invention concerne un engrenage de marche AV pour bicyclette. Cet engrenage comprend un arbre de pédalier entraîné par pédales, des disques internes et externes portant sur l'arbre de pédalier sans interférence pendant la rotation dudit arbre, un boîtier qui est monté sur l'arbre de pédalier et qui tourne dans le même sens (AV ou AR) que la tige de pédale, un barbotin monté sur la circonférence extérieure du boîtier, un pignon d'entraînement AV faisant partie intégrante du barbotin d'entraînement, maintenu par le disque interne et portant contre la circonférence interne du boîtier, un cliquet bi-directionnel permettant de transmettre sélectivement le mouvement de rotation du boîtier au pignon de marche AV ou celui de marche AR, et un pignon intermédiaire de sélection de sens de marche qui inverse le sens de rotation du boîtier lorsque ledit boîtier tourne en marche arrière et qui fait tourner le barbotin en marche AV. Grâce à l'engrenage d'entraînement en marche AV décrit ci-dessus, la bicyclette roule toujours en marche AV dans le même rapport de vitesse, quel que soit le sens de rotation du pédalier.
PCT/KR2000/000146 1999-02-25 2000-02-23 Engrenage de marche av pour bicyclette Ceased WO2000050296A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU26980/00A AU2698000A (en) 1999-02-25 2000-02-23 Forward driving gear for bicycle

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR19990006259 1999-02-25
KR1999/6259 1999-02-25
KR2000/8157 2000-02-21
KR1020000008157A KR100361581B1 (ko) 1999-02-25 2000-02-21 자전거용 전진구동 변환장치

Publications (1)

Publication Number Publication Date
WO2000050296A1 true WO2000050296A1 (fr) 2000-08-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2000/000146 Ceased WO2000050296A1 (fr) 1999-02-25 2000-02-23 Engrenage de marche av pour bicyclette

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KR (1) KR100361581B1 (fr)
AU (1) AU2698000A (fr)
WO (1) WO2000050296A1 (fr)

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EP2348230A1 (fr) * 2010-01-20 2011-07-27 Tai-Her Yang Bicyclette dotée d'une entrée bidirectionnelle et d'une sortie unidirectionnelle

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CN105035250B (zh) * 2014-04-22 2019-11-05 罗天珍 一种自行车及助力车用无级变速器
KR101744386B1 (ko) 2015-03-09 2017-06-07 윤근수 자전거용 증속 동력변환장치
KR102074833B1 (ko) * 2018-07-10 2020-02-07 한은수 다단 변속장치

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WO1997021587A1 (fr) * 1995-12-08 1997-06-19 World Industry Co., Ltd. Appareil permettant de modifier le sens de force motrice d'une bicyclette
WO1997024252A1 (fr) * 1995-12-30 1997-07-10 World Industry Co., Ltd. Changement de vitesses integre a un moyeu de bicyclette
WO1998056648A1 (fr) * 1997-06-09 1998-12-17 World Industry Co., Ltd. Dispositif destine a changer le sens de rotation de l'axe de pedalier d'une bicyclette

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JPH06179388A (ja) * 1992-12-15 1994-06-28 Bridgestone Cycle Co 自転車用変速装置
KR200167316Y1 (ko) * 1999-04-08 2000-02-15 김진욱 자전거 역 페달링 전진장치

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Publication number Priority date Publication date Assignee Title
WO1997021587A1 (fr) * 1995-12-08 1997-06-19 World Industry Co., Ltd. Appareil permettant de modifier le sens de force motrice d'une bicyclette
WO1997024252A1 (fr) * 1995-12-30 1997-07-10 World Industry Co., Ltd. Changement de vitesses integre a un moyeu de bicyclette
WO1998056648A1 (fr) * 1997-06-09 1998-12-17 World Industry Co., Ltd. Dispositif destine a changer le sens de rotation de l'axe de pedalier d'une bicyclette

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2348230A1 (fr) * 2010-01-20 2011-07-27 Tai-Her Yang Bicyclette dotée d'une entrée bidirectionnelle et d'une sortie unidirectionnelle
JP2011152912A (ja) * 2010-01-20 2011-08-11 Tai-Her Yang 自転車
CN102190051A (zh) * 2010-01-20 2011-09-21 杨泰和 可锁住或释放双向输入单向输出脚踏车结构

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Publication number Publication date
AU2698000A (en) 2000-09-14
KR100361581B1 (ko) 2002-11-21
KR20010006665A (ko) 2001-01-26

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